Remember, is the measureof the centralangleassociatedwith.is of a circle.The circumferenceof the circleisinches.Thearc lengthof is
inches.
In this lessonwe studythe secondtype of arc measure—themeasureof an arc’s length.Arc lengthis directly
relatedto the degreemeasureof an arc.
Supposea circlehas:
- circumference
- diameter
- radius
Also,supposean arc of the circlehas degreemeasure.
Notethat is the fractionalpart of the circlethat the arc represents.
Arc lengthLessonSummary
This lessoncan be summarizedwith a list of the formulasdeveloped.
- Radiusand diameter:
- Circumferenceof a circle: